/Engine/Plugins/EnhancedInput/Source/EnhancedInput/Public/UserSettings/EnhancedInputUserSettings.h
Returns the number of mappings to this key
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="Enhanced Input|User Settings", Meta=(ReturnDisplayName="Number of mappings")) virtual int32 GetMappingNamesForKey ( const [FKey](API\Runtime\InputCore\FKey) & InKey, [TArray](API\Runtime\Core\Containers\TArray)< [FName](API\Runtime\Core\UObject\FName) > & OutMappingNames ) const